Shopify Plugin
PayGuard
A native Shopify plugin that helps store owners assess the risk of Cash on Delivery customers before dispatch, using a three-tier color-coded scoring system backed by cross-store behavioral data.
Project Snapshot
Platform
Shopify
Risk Tiers
3 Levels
Data Sources
2+
Shopify merchants had no reliable way to identify COD customers likely to refuse payment or return orders, resulting in significant losses from undelivered shipments and wasted logistics costs.
Ecello built a fully integrated Shopify plugin with its own GUI that pulls customer data through the Shopify API, cross-references a proprietary seed database, and surfaces a Red, Yellow, or Green risk tier instantly when a COD order comes in. Merchants can also flag customers, feeding a shared intelligence network that improves accuracy across the entire user base.
Merchants gain instant visibility into COD risk before committing to a shipment, reducing return-to-origin losses, enabling smarter fulfillment decisions, and contributing to a network that gets more accurate with every transaction.
Overview
About this project
PayGuard is a native Shopify plugin built for e-commerce store owners who offer Cash on Delivery as a payment option. It gives merchants a clear, instant picture of whether a customer placing a COD order is trustworthy or not, before the order is ever dispatched. The plugin pulls available customer data through the Shopify API, cross-references it against a proprietary database, and presents the merchant with a simple risk score backed by real order history.
The Problem
What we were up against
Cash on Delivery is one of the most popular payment methods in price-sensitive and emerging markets. A customer can place a COD order with no intention of paying, refuse delivery at the door, or simply not be home. The merchant absorbs the full cost of shipping there and back, plus the time the product sat unavailable in transit. What made this worse was that there was no shared record across stores. A customer could do this repeatedly at different shops and no merchant would be any wiser. Existing tools did not solve this. Order history within a single store tells you nothing about what a customer did elsewhere, and nothing purpose-built existed inside the Shopify ecosystem to address this specific pain.
The Approach
How we solved it
We built PayGuard as a fully integrated Shopify plugin with its own dedicated interface inside the Shopify admin panel. When a COD order comes in, the merchant opens PayGuard and immediately sees a risk profile for that customer showing how many COD orders they have successfully paid for, how many times they refused payment or failed to collect, how many orders they returned, and an overall risk score displayed as a color-coded tier. The system draws on two data sources: the Shopify API and our own proprietary database, which we built and populated before the plugin went live so merchants would have real signal from day one.
Features
What we built
Customer risk is surfaced instantly when a COD order is placed. No extra steps, no context switching, no delay between order and decision.
Every customer is assigned a Red, Yellow, or Green tier based on their history. The decision is immediate without reading a report.
Full breakdown of the customer's COD performance across all stores in the network, not just the merchant's own shop.
After any COD order, merchants can flag the customer as a successful payer, a refusal, or a return. These flags feed the shared database and affect the customer's score across the entire network.
Pre-loaded with aggregated behavioral data so the system provides meaningful risk scores from the very first day of use, without waiting for the merchant's own history to build up.
Fully embedded in the Shopify admin. Risk data lives exactly where decisions are made, with no external tools or tab switching required.
Engineering
Technical challenges
Shopify API Constraints
Shopify's data access policies are strict and intentionally limited. We engineered within those boundaries carefully, extracting maximum useful signal from permitted data points while staying fully compliant with Shopify's Partner Program policies.
Cold Start Database Problem
A risk scoring system is only useful if it has data to work with. We built and seeded a proprietary customer behavior database before the plugin was released, giving the system enough baseline data to return meaningful scores from day one.
Customer Identity Matching
Customers do not always use the same phone number, email, or address across different stores. We built a matching layer using fuzzy logic to link records across identifiers, so a customer cannot change one detail and appear as a clean new profile.
Abuse-resistant Flagging
Any system that lets users submit data about other users can be abused. We designed the flagging mechanic with safeguards to prevent merchants from maliciously targeting customers or inflating negative scores without legitimate evidence.
Results
Business impact
Merchants who use PayGuard can identify high-risk COD orders before they ship. Blocking or converting even a fraction of those orders to prepayment directly reduces shipping costs and eliminates the dead weight of returned undelivered parcels. Instead of making fulfillment decisions on instinct, merchants make them on evidence. The process becomes consistent and auditable. Unlike a single-store tool, PayGuard benefits from scale. Every merchant who joins adds to the intelligence pool, and the risk scores become more accurate as adoption grows.
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